503 Service Unavailable when trying to "Update Service References" in Silverlight app...

I'm getting this error dialog when I try to "Update Service References" in my Silverlight app...

There was an error downloading https://....
The request failed with HTTP status 503: Service Unavailable.
Metadata contains a reference that cannot be resolved:...
...
(See attached screen shot)503-Service-Unavailable-on-Updat.png

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